You have done it before, but when you say, "I know calculus, " Sometimes it means you know it, sometimes it means you know of some fellow who does or you met somebody who knows.

你们以前学过,但当你们说,"我懂微积分",有时这表明你们懂,有时表示你知道谁懂,或者你遇到了懂这个的人

耶鲁公开课 - 基础物理课程节选

because we'd have different sleep times and then sometimes I would sleep loud and she... you know.

因为我们睡觉的时间不一样，有时候我睡觉的声音大，她就会……你懂得。

与室友和睦相处 - SpeakingMax英语口语达人

You know, I still play here, and sometimes I umpire here, so it's a great park.

我仍然在这儿踢球，而且有时候在这儿当裁判，所以这是个很棒的公园。

中央公园的时光 - SpeakingMax英语口语达人

And I mean, sometimes it's luck, but I say mostly it's skill, you know,

我的意思是，有时候靠运气，但是要我说，大部分还是看技术，你知道。

体育相片的魅力 - SpeakingMax英语口语达人

I mean, you might miss the countryside, don't know. I do sometimes.

你可能会想念乡村了。我有时候会这样。

讲述伦敦的生活 - SpeakingMax英语口语达人

And I don't know, it's good and bad sometimes.

我不知道这是好是坏。

聪明的学生很多 - SpeakingMax英语口语达人